QRCode class

Quick response code (QRCode) is a two-dimensional barcode. It can efficiently store more information in a smaller space than 1D barcodes. Each barcode can store values up to 7089 characters. It is mostly used for URLs, business cards, contact information, etc.

The QRCode consists of a grid of dark and light dots or blocks that form a square. The data encoded in the barcode can be numeric, alphanumeric, or Shift JIS characters.

  • The QR Code uses version from 1 to 40. Version 1 measures 21 modules x 21 modules, version 2 measures 25 modules x 25 modules, and so on. The number of modules increases in steps of 4 modules per side up to version 40 that measures 177 modules x 177 modules.
  • Each version has its own capacity. By default, the barcode control automatically sets the version according to the length of the input text.
  • The QRCode is designed for industrial uses and also commonly used in consumer advertising.

The amount of data that can be stored in the QRCode symbol depends on the inputMode, codeVersion (1, ..., 40, indicating the overall dimensions of the symbol, i.e. 4 × version number + 17 dots on each side), and errorCorrectionLevel. The maximum storage capacities occur for codeVersion 40 and ErrorCorrectionLevel.low.

Inheritance

Constructors

QRCode({QRCodeVersion? codeVersion, ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.high, QRInputMode inputMode = QRInputMode.binary, int? module})
Create a QRCode symbology with the default or required properties.

Properties

codeVersion → QRCodeVersion?
Define the version that is used to encode the amount of data.
final
errorCorrectionLevel → ErrorCorrectionLevel
Define the encode recovery capacity of the barcode.
final
hashCode → int
The hash code for this object.
no setterinherited
inputMode → QRInputMode
Define a specific set of input mode characters.
final
module → int?
Specifies the size of the smallest line or dot of the barcode.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited